This is Thread Locking Compound from Tamiya. Must be used on metal or steel items, not plastic.
Color is blue
Apply thread lock to the threads before installing.
Prevents the screws from working loose, which will happen if it is not used. It is very effective and easy to use.
Screws can be loosened or removed for maintenance by using extra pressure.
One Tube (10cc) of Thread lock
Do Not use this on plastic, as it will melt the plastic!